Low Pressure Fuel Pump Control for GDI Engine Stability
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Solution Overview
Problem
Conventional methods for controlling low pressure fuel pumps in GDI engines fail to maintain stable fuel supply when high pressure fuel pump failures or estimated failures occur, leading to issues like reduced start acceleration, engine warning lamps, and potential engine shutdown, especially under extreme temperature or high altitude conditions.
Innovation Solution
A system and method that monitors high pressure fuel pressure in real-time, preemptively boosting low pressure fuel pump pressure to predetermined settings (AP, BP, or CP pressures) based on failure information, measured pressure differences, or spill valve control values to ensure stable fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If variable flow control method is used to minimize current consumption and maximize fuel consumption enhancement, then fuel efficiency is improved, but fuel supply stability deteriorates under extreme conditions
Solution Approach 1:
The system preemptively boosts low pressure fuel pump output when high pressure fuel pressure drops below a predetermined threshold, before complete fuel supply failure occurs. This preliminary action prevents engine performance degradation and maintains reliable fuel supply under extreme conditions while avoiding unnecessary high-pressure maintenance during normal operation.
Solution Approach 2:
The control system continuously monitors high pressure fuel pressure and dynamically adjusts low pressure fuel pump output based on real-time feedback. When high pressure fuel pressure drops below the threshold, the system automatically increases low pressure pump output to compensate, creating a closed-loop control that maintains fuel supply stability without wasting energy during normal operation.
2Productivity
If low pressure fuel pump pressure is maintained at low levels for fuel consumption enhancement, then fuel efficiency is improved, but engine performance and reliability worsen under extreme conditions
Solution Approach 1:
The system dynamically adjusts low pressure fuel pump output based on real-time high pressure fuel pressure conditions. During normal operation, the pump operates at low pressure for fuel efficiency. When high pressure fuel pressure drops below the predetermined threshold, the system automatically increases pump pressure to maintain reliable fuel supply, creating a dynamic adaptation to operating conditions.
3Reliability
If conventional methods set high target fuel pressure to solve high pressure fuel pump failure, then fuel supply stability is improved, but energy consumption increases
Solution Approach 1:
Instead of uniformly maintaining high target fuel pressure across all operating conditions, the system applies high pressure only locally when and where needed - specifically when high pressure fuel pressure drops below the predetermined threshold. During normal operation, the system maintains low target fuel pressure for energy efficiency, creating a localized response to specific conditions.
Data Source
AI summary
A method of controlling a low pressure fuel pump of a gasoline direct injection (GDI) engine includes receiving failure related information of a high pressure fuel pump, boosting, if the high pressure fuel pump is failed based on the failure related information of the high pressure fuel pump, a fuel pressure of the low pressure fuel pump to a setting pressure and controlling, if the high pressure fuel pump is not failed, the fuel pressure of the low pressure fuel pump based on a measured fuel pressure with respect to a target fuel pressure of the high pressure fuel pump or a change of a control value of the GDI engine. A corresponding control system includes a fuel supply pressure controller, among other components, which is operated by a predetermined program for executing the method of controlling the low pressure fuel pump of the GDI engine.